C#: Add change note.

michaelnebel · michaelnebel · commit d336e1dfb810 · 2025-01-03T15:36:16.000+01:00
diff --git a/csharp/ql/lib/change-notes/2025-01-03-allow-ref-struct.md b/csharp/ql/lib/change-notes/2025-01-03-allow-ref-struct.md
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+---
+category: minorAnalysis
+---
+* C# 13: Added extractor support and call dispatch logic (data flow) for the (negative) type parameter constraint `allows ref struct`. Added extractor support for the type parameter constraint `notnull`.
